On Sunday, February 13, 2022 5:37:08 PM EST Chris Albertson wrote:
> On Sun, Feb 13, 2022 at 10:42 AM Ralph Stirling <
>
> ralph.stirl...@wallawalla.edu> wrote:
> > Freecad "path" workbench generates g-code toolpaths. You can paste
> > your openscad source code into freecad with the openscad workbench.
> Will it handle this part, a lead screw? Last I looked, Path Workbench
> only did 2.5D milling. It would be great if it would do this. I
> assume you have to use a 4-axis machine to mill a leadscrew or a CNC
> Lathe. It it has been upgraded, I'll download it again and test it
> ou
Not even todays weekly AppImage can paste it, import the csg, yes but
goes nuts for about 10 minutes complaining about the missing qt-5 5.15
stuff and winds up displaying nothing.
If its going to be this picky, I'll just write it by hand once I get all
the mill accessories made, installed and calibrated, should be about 70
lines in two loops. First loop to set the depth, 2nd to drive y as a sub
to 1st, maybe with a seperate leading z depth, y run to turn to shave it
round 1st. Make it 110 LOC. I love loops. I hate writing g-code that does
nothing but unwinds a @$#%* loop.
This looks like simple code, sightly over a screen full vertically, but
it needs 24g of the 32g in this machine to render it. And takes the
latest OpenSCAD 10 minutes to f6 the half nut. The scad is attached.
> > --
>
> Chris Albertson
> Redondo Beach, California
>
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> .
Cheers, Gene Heskett.
--
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Genes Web page <http://geneslinuxbox.net:6309/gene>
// Simple Butress threads for vise screw
// By Maurice E. Heskett, translated from wikipedia drawings, in Feb 2022
// included angle of cutting tool 45 degrees
// pitch p in mm
// option 1 ratios d=3/4p & f=1/8p
// option 2 ratios d=2/3p & f=1/6p
// major diameter 2" or 50.8mm
lmbr=50.8;// thickness of lumber
mdt=lmbr-6;// is 3mm per side of thread depth
tol=-.3;// set fit clearance from 2" is half nozzle +.1mm
od=mdt;// set od of internal thread
pitch=4;// mm
an1=30; // fixed angle for 90 degree workface
an2=0;
an=an1+an2;
f=pitch*.125; //option 1
d1=pitch*.75;//set depth of tooth
//tr=mdt-(pitch*.75)/2;// set depth of tooth relative to md
echo(14,lmbr,mdt,tol,od,pitch,d1,f); // show points so far
module buttress_thread(tol)
{// generate the thread shape, + Z tilted so edge is at thread pitch
translate([0,.25,0])rotate([95,0,0])
{
translate([0,1.5,0])cube([.5,d1,1.6],center=true);
difference()
{
translate([0,pitch+.5,0])
rotate([0,0,an])
cylinder(h=1.6,d=d1*2.5,center=true,$fn=3);
translate([3.875,pitch+1.65,.1])
rotate([0,.0,0])
cube([2.5,2.4,1.85],center=true);
}
}
};
module buttress_bolt(tol)
{
echo(39,tol);
difference()
{
union()
{ $fn=180;
translate([0,0,25.4]) cylinder(h=50.8,d=od+tol,center=true);
for(i=[0:2:359*4.7])// 4,6 2 start threads
{ k=i/30;
rotate([0,0,i])translate([.5*(mdt+tol),0,-7+k])buttress_thread();
rotate([0,0,i+180])translate([.5*(mdt+tol),0,-7+k])buttress_thread();
}
}
translate([0,0,-6])cylinder(h=6,d=55,true);
translate([0,0,50.35])cylinder(h=6,d=55,true);
}
};
module buttress_halfnut(tol)
{
difference()
{
echo(61,tol);
translate([16,0,24.7]) cube([32,66,49],center=true);
buttress_bolt(tol);
}
};
//buttress_thread(0);
buttress_bolt(-.3);
//buttress_halfnut(.3);
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